A flat roof repair can be done in two ways. The first one of these is contacting a roofing company and the second is undertaking the roof repair by your self. Although the first way is the easier way out since the roofing professionals are better equipped to assess the damage and provide relevant solution, the second option seems feasible when the damage is not massive and can be handled in-house. However, getting an estimate from the professional repair company with respect to the work involved, you can decide upon the option of outsourcing the roof repair work or doing it your self.
Whether you take the repair in your own hands or get it done from professionals, the crux of the matter is that there is a need to assess the amount of damage and then provide adequate roofing material to repair the roof. Until the time the roof is repaired, it must be covered with a protective material like tarp to prevent any further leakage due to precipitation.
A gravel or tar roof is easily repairable, than an EPDM rubber roof. A rubber roof would be better replaced than repaired. For roofs of other material first collect the material required for the repair and then start the work.
If you plan to undertake the repair work by yourself, you can get the adequate information required for the purpose, online. Many sites display the roof repair work for different types of roofs with different roofing material.